Process for dyeing artificial silk



Patented Apr. 24, 1928.

. UNITED STATES, PATENT OFFICE.

1mm nanmnnr, PERCY CHOBLEY, Ann cnnn'ron nu'rnnn, or mucnns'rnn, Enenann assrenons. ro :emrrsn n n s'rorrs conrona'rron Lmnnn, or m. cnns'rnn, nnemn, a company 02- GREAT nnnram AND mum).

raocnss non nYnme ARTIFICIAL srnx No Drawing. Application flied April '2, 1927, Serial No. 180,610, and in Great Britain June 4, 19M.

Accordin to this invention, regenerated- .10 naphthalene derivatives asend components.

The said components are 1-: 8-dihydro'xy naphthalene sulphonie acids, 1:8-amino naphthol-sulphonic acids and N-substituted derivatives of the latter. Secondary disazo v compounds are thoseobtained by the action ofia diazoazo compound on an amine or a phenol. The use oi dyestuffs of the present type for dyeing chrome mordanted wool and for chrome printinghaslon been known,

but we'havenow' made the entlrely unexpected discovery that the dyestuffs have a good afiinity for regenerated cellulose silks and possess thevaluable property of giving level dyeings' on these fibres.

The regenerated cellulose silk fibres have hitherto given considerable diiiiculty in dyeing owing to the fact that they are liable to possess an uneven aflinity for dyestufi's, which causes the dyeings obtained to be unlevel. This difliculty is encountered particularly when it is desired to' dye the fibre in blue and green shades. The shades which we obtain are blue, reen and black and are very level, and our iscovery is therefore of v considerable technical value.

The aminosalicyhc aclds we use may be either 5-aminosalicylic acid (COOH; OH: NH .=1:2: 5)

' 40 or its 1: 2:3 isomer, or the technical mixture of these two isomers, and the homologues of any of these may be used. As middle components, there may be used anaphthylamine, l-amino-Q-naphthol others.

l-naphthylamine-G- or 7-sulphonic acids, 1-

A dyebath is made up from 3000 parts of water, 20 parts of Glaubers salt, 2 'parts of soap and one part of the secondary disazo dye obtained by combining 5-aminosalic lie acid with I-amino-Q-naphthol ethyl et er,

rediazotizing and combining with 1:8-dihydroxynaphthalene 4 sulphonic acid. 100 parts of the regenerated cellulose silk are entered into the bath at about 30'. C., the bath is then heated to about C. and dyemg allowed to proceed for about one hour. The silk is then removed, rinsed and dried. The resulting dyeing is a level bright green shade.

The following table contains other examples of the shades which can be obtained by our invention Secondary disuo dies from-- shadeal l First eorn- Middle component pone, End component flaminosaiicyiic a-naphthyi- 1:8-aminonaphthoi- 'Groeniahacid. I amine. 3:6-disulphonie black.

mm .-ditto. 1:8-diliydtox a a- B! b thalene-3zfia in ilu.- not phonic acid. Ditto ditto.. 1:8-aminonaphthoi- Blue-black.

2:4 3iisuiphonic sci Aminosaiicyiic m-amino-p- 1:8-dihydroxyna h- Blue.

acid. Tech- I cresoi. thaienwsuipiionnical mixture. ic acid. Aminosaiicyiic n-naphthyl- 1:8-dihydroxyna h- Blue.

acid. Techamine. thalene-t-suip onnicai mixture ic acid.

itto ...ditto.... l-wetyiamino-8- Blue-black.

naphthoi-3z6-disulg gonic acid. Ditto Cloves acid 1: ihydroxynaph- Groenish.

(mixed). lthaiuge-i-suiphonblue. cac p-amino-ocrea-naphthyl- 1:8-dih drox h- Biue.

sotinic acid. amine. thalehedzmiii- 0 mi am i ii iir n o b -a no-p-cre- 0..-. or a i sotinic acid. twain-3:04a ii]- my u.

, phonic acid.

. What we claim and desire to secure by Letters Patent is 1.The process of dyeing which com rises dyeing regenerated cellulose silks wit the secondary disazo dyestuifs which can be made by combining amino-oydroxg carbox acids of the benzene series witht e usual iddle components, further diazomade by combining amino-o-hydrox carboxy acids of the benzene series with t e usual middle components further diazotizing and combining with a sulphonated 5 1:8-dihydroxynaphthalene.

3. The process of dyeing which comprises dyeing regenerated cellulose silks with the secon ary disazo dyestufis which can be made by combining amino-o-hydroxy- 10 carboxy acids of the benzene series with the usual middle components, further diazotizing and combining with a ,1 B-dihydroxynaphthalene-et-sul honic acid.

4. As new in ustrial products, regenerated cellulose silks dyed by the process of claim 1.

In, testimony whereof we aflix our signatures. y

' JAMES BADDILEY. I PERCY CHORLEY.

CARLTON BUTLER. 

